Frictional hoisting-drufvl



(No Model) A J DYAVIS PRIGTIONAL HOISTING DRUM. No. 304,300. Patented.Sept. 2, 1884.

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FRICTIONAL HOl STlNG-DRUM.

SPECIFICATION forming part of Letters Patent No. 304,300, datedSeptember 2, 1884.

Application filed July 3, 1884. (N0 model.)

with a toothed driving-wheel having a metallic friction-cone attachedatone side, of a drum having a ring cast upon one of its end flanges, andwooden blocks secured inside such ring by dovetailed ribs, and turnedout internally to fit the metallic cone-upon the gear-wheel. Thisconstruction is intended to secure certain results not attainable bythat patented to me September 23, 1879, as No. 219,922, and in which thewooden frictionblocks were secured inside the rim of the tootheddriving-wheel. Such construction was adopted chiefly to economize thelongitudinal space occupied upon the drum-shaft by the frictionaldevices; but it evidently restricted the diameter of the friction-conesby the inner dimensions of the gear-wheel web; and my present inventionsubstitutes for such arrangement one in which the cones may be made ofany required diameter, while securing the advantages of the blockholdingde- Vices employed in my former patent.

My improvement will be understood by reference to the drawings annexed,in' which Figure 1 is a side view of the toothed gearwheel' a andmetallic cone 1). Fig. 2 is a longitudinal section of the entireconstruction, excepting the drum-shaft S and relief-spring g. Fig. 3 isan end view of the drum and wooden friction-blocks.

The gear-wheel a is provided with a metallic cone, 1), preferably castas a hollow shell upon the side of the gear-wheel, and the wooden blocksa are secured, by dovetailed ribs 6, as in my former invention, insideof a ring, (1, which is attached to one end of the drum 0. Such ring ispreferably cast upon the flange d at one end of the drum, and the wholeconstruction is therefore produced without any increase in the number ofpieces em ployed in my former invention, while the size of the cones maybe determined without restriction by the inner diameter of the gearwheelweb, as in my former construction.

'In Fig. 2 the cone I) is proportioned almost as large as the plate a atthe side of the gearwheel will admit; but where it is desired to make itlarger, the plate a may be extended above the teeth of the wheel to anydesired extent, and the ring and wooden blocks upon the drum be made ofcorresponding diameter.

The bearings or pillow-blocks for the shaft S would be placed at-T andT, outside of .the drum and gear, and the latter be pressed togetherwhen in action, in the usual way. The space inside the blocks 0 and coneZ), I utilize for the insertion of a relief-spring, g, to separate theiron and wooden cones when not in action, and to thus relieve anyrubbing or wear at such time.

I am aware that wooden and metal cones have been used heretofore inhoisting-drums, and do not therefore claim such combination except whenconstructed as I claim herein.

I am also aware of United States Patent No. 158,967, issued January 19,187 5, to J. S. Munday, for a frictional hoisting-gearing, in which aseries of wooden blocks are affixed to the side of the gear-wheel toform awooden cone, which fits into a hollow iron shell cast upon thedrum. I am also aware that the said patent shows a relief-spring locatedlike that in Fig. 2 of my drawings, and I cannot, therefore, claim suchspring or its functions as new but I am also aware, of my own knowledge,that such spring has long been publicly used to perform the samefunction, in separating the parts of friction driving apparatus, andthat no claim can be based upon sucha use of said spring.

I am also aware, of my own knowledge, that various combinations ofwooden and metallic friction-cones have been in public use with arelief-spring over two years before the date of the said Mundays patent,No; 158,967, and of my former patent, No. 2l9,922,whereby the scope ofeach of said patents, as well as of my present application is restrictedto the construction shown therein; and I therefore disclaim anythingexcept the construction I have herein specifically set forth, and claimthe same in the following manner:

The combination, withthe driving gearwheel a and the metallic cone 1),attached to its side, of the drum 0, having at one end the flange (2,provided with the ring (1, and the said ring being constructed with thedove- In testimony whereof I have hereunto set my hand in the presenceof two subscribing witnesses.

tailed ribs 0, and having the blocks 6 secured I ALBERT J. DAVIS.

\Vitnesses:

Tnos. S. CRANE,

O. C. HERRIOK.

therein by said ribs, and fitted t0 the metallic cone 6, substantiallyas herein shown and described. e

